1965 Muncie M-21 No Drain Plug

What's the best way to drain the old lube out of a M-21 Muncie? No drain plug, anybody got a home made remedy, short of removing the shifter, removing the front 4 bolts and rotating the transmission 90 degrees?

Thanks.

 

Drill and tap a hole.

 

Your right about the M-21's not having a drain plug... My M-22 I sold a few years back had one..
On the M-21's, I think there's a little indentation on the case that shows where to drill and tap for a drain plug... Search the net for a tap and drill size chart for the type of drain plug your using...

 

Pull the bottom bolt from the tailshaft

 

Problem solved..... Available at NAPA for $15. Basically a grease gun with a different cap. Use it to suction out the old lube, and to push in some new lube.

 

I tried a similar device once.... didn't work. It was cold winter at the time and the 90W oil just wouldn't flow. I'd drill and tap.

my 2¢

.bjb

 

turkey baster used one with a short piece of hose on an old shovelhead 4spd (harley) for years. Looks like it would work no the muncie too. Best part is you've probably already got one in a kitchen drawer----if not you'll still only be out a coupla bucks

 

Can anyone confirm if this actually works? If so it sure sounds like the simplest solution.

 

I think the bottom tailshaft housing bolt fits into a blind hole, so wouldn't drain. The best bet is to drill and tap the drain plug boss, very obvious on the attached pics, your case should look nearly the same.

 

You've no idea how many times I've been threatened with divorce over that and I'm talken 32 years.

 

Not if you jack up the front of the car like most DIY without a hoist will do anyway .

 

Filled the tranny today with GL-4 and then decided to see if the tailhousing bolts could indeed be used as a drain. I removed the three lowest bolts, all were blind tapped, no fluid drains out.

So on a early M-21 4-speed Muncie, the "pull the bottom tailshaft bolt" method is a riddle, wrapped in a mystery, inside an enigma.